The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
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EFFECT OF MAGNESIUM OXIDE CONTENTS ON THE PROPERTIES OF EXPERIMENTAL ALGINATES

산화마그네슘 함량이 실험적 알지네이트 인상재의 특성에 미치는 영향

  • Bae Ill-Hwan (Department of Prosthodontics, Division of Dentistry, Graduate School, Kyung-Hee University) ;
  • Woo Yi-Hyung (Department of Prosthodontics, Division of Dentistry, Graduate School, Kyung-Hee University) ;
  • Choi Dae-Gyun (Department of Prosthodontics, Division of Dentistry, Graduate School, Kyung-Hee University)
  • 배일환 (경희대학교 치과대학 치과보철학교실) ;
  • 우이형 (경희대학교 치과대학 치과보철학교실) ;
  • 최대균 (경희대학교 치과대학 치과보철학교실)
  • Published : 2003.10.01
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Abstract

Statement of problem : Magnesium oxide may increase pH of alginate, and supply magnesium ions to the polymerization reaction of alginate. Purpose : This study was designed to evaluate the influence of incorporation of magnesium oxide to alginate composition. Material and Method : Seven kinds of experimental alginates were prepared and used for the experiments. Components with unchanging concentrations were sodium alginate 15%, calcium sulfate 14%, sodium phosphate 2%, and zinc fluoride 3%. Contents of magnesium oxide were varied as 0%, 1%, 2%, 3%, 4%, 5%, 6%. Diatomaceous earth were added to each experimental groups as balance to be 100%. Control group was a MgO 0% group. Working time, setting time, elastic recovery strain in compression, compressive strength and tear resistance were measured were measured. Sample size for each groups were 10. Arithmetic means were used as each groups representative values. Regression test between MgO contents and results, Duncan's multiple range test, and One-way ANOVA test were done between groups at level of 0.05. Results : 1 Magnesium oxide made the working time and setting time as longer(p<0.0001). 2 Magnesium oxide did not alter the elastic recovery(p>0.05). 3. Magnesium oxide contents between 2% and 4% exhibited the lowest strain in compression on alginates(p<0.0001). 4. Magnesium oxide made the compressive strength and the tear resistance stronger(p<0.0001). Conclusion : These results mean that setting time of alginate maybe controlled and that mechanical properties maybe improved by the incorporation of magnesium oxide into alginate, without any reduction of elasticity.

Keywords

References

  1. Cook W : Alginate dental imperssion materials chemistry, structure, and properties. J Biomed Mater Res. 20:1-24. 1986
  2. Unemori M, Matsuya Y, Matsuya S, Akashi A, Mizuno K. Akamine A. : Formulation of glutaraldehyde disinfectant for alginate impressions. Dent Mater J. 18:337-46. 1999
  3. Anastassiadou V, Dolopoulou V, Kaloyannides A. : The relation between thermal and pH changes in alginate impression materials. Dent Mater. 11: 182-5. 1995
  4. Anastassiadou V, Dolopoulou V. Kaloyannides A. : Relationship between pH changes and dimensional stability in irreversible hydrocolloid impression material during setting. Int J Prosthodont. 8:535-40. 1995
  5. Ishikawa K, Miyamoto Y, Kon M, Nagayama M, Asaoka K. : Non-decay type fast-setting calcium phosphate cement: composite with sodium alginate. Biomaterials. 16:527-32. 1995
  6. Ishikawa K. Miyamoto Y. Takechi M. Toh T. Kon M, Nagayama M, Asaoka K. : Non-decay type fast-setting calcium phosphate cement: hydroxyapatite putty containing an increased amount of sodium alginate. J Biomed Mater Res. 36:393-9. 1997
  7. Ishikawa K. Miyamoto Y, Takechi M, Ueyama Y, Suzuki K. Nagayama M, Matsumura T. : Effects of neutral sodium hydrogen phosphate on setting reaction and mechanical strength of hydroxyapatite putty. J Biomed Mater Res. 44:322-9. 1999
  8. Inoue K. Kakigawa H, Matsushita S. Yamada S. Hayashi I. : Fundamental studies of elastic impression materials (part III). Viscoelastic properties from start of mix for alginate impression materials. Shika Rikogaku Zasshi. 19:48-52. 1978.
  9. Abuasi HA. McCabe JF. Carrick TE, Wassell RW. : Displacement Rheometer: a method of measuring working time and setting time of elastic impression materials. J Dent. 21: 360-6. 1993
  10. Shigeto N, Yamada Y. Iwanaga H. Subianto A. Hamada T. : Setting properties of alginate impression materials in dynamic viscoelasticity. J Oral Rehabil. 24:761-5. 1997
  11. Picton DC, Creasey SJ. : Some causes of failure of crowns, bridges and dentures. J Oral Rehabil. 16: 109-18. 1989
  12. Becker TA, Kipke DR. Brandon T. : Calcium alginate gel: a biocompatible and mechanically stable polymer for endovascular embolization. J Biomed Mater Res. 54:76-86. 2001
  13. Vrijhoef MM, Lourens FL, Leydekkersgovers GF. : A modified technique to determine the tear energy of impression materials. J Oral Rehabil. 13: 325-8. 1986
  14. Cohen BI. Pagnillo MK. Musikant BL, Deutsch AS. : Tear strength of four irreversible hydrocolloid impression materials. J Prosthodont. 7: 111-3. 1998
  15. Hondrum SO. Fernandez R. : Effects of long-term storage on properties of an alginate impression material. J Prosthet Dent. 77:601-6. 1997
  16. Veres E, Slabbert JC, Becker P. : The effect of dust-suppressant additives on the physical properties of an irreversible hydrocolloid. J Prosthet Dent. 63: 90-4. 1990